Dial Up modem's days are long gone but Land line still exists either in the form of home pbx or PSTN, An Arduino based Dial Up modem shield can be used for a lot of fun projects. I'm no electronics expert but modem chips are already available with AT Command support http://www.conexant.com/Product/modems/embmodems/CX93040/Pages/default.aspx

Yes Serial based chips are also available It can open a whole new world to Arduino Telephony with more compatible shields like 4 port extension we can build a small Arduino based home Telephone Exchange system with all sort of programing we want If Arduino guys don't do it then someone should put this project to KickStarter

Dial Up modem's days are long gone but Land line still exists either in the form of home pbx or PSTN, An Arduino based Dial Up modem shield can be used for a lot of fun projects. I'm no electronics expert but modem chips are already available with AT Command support http://www.conexant.com/Product/modems/embmodems/CX93040/Pages/default.aspx

I think Arduino can produce this shield in no time what do you think? :~

das250

This would be a good project .Has anybody been able to do basic text /data control / file transfers via a 56kmodem and an arduino ?.

I have a place that has land line but no mobile cell coverage (out on a farm ) so it would be nice to be able to talk to a modem and transfer data or send messages for control or for modem to automatically via an arduino .. send this data to another device via land line so it can transfer this data to an online html page etc or online file ...

I'm surprised this has still not become a viable project. As it's an ideal system to swap data over very long distances. Probably due to issues/cost of getting a shield certified for connection to phone line.Radicom seem to do some ideal looking moduleshttp://www.radi.com/modular51.htmhttp://www.radi.com/modular29.htmbut probably not for hobby use.

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Radicom specializes in designing and manufacturing modems for embedded system designers, original equipment manufacturers (OEM) and volume corporate users.

das250

These look great any idea how much they cost ?I guess it is possible to use these as they have approval to connect.

My needs would be to have an Arduino data logger collect time stamped information then , connect it to a modem shield which at time interval X rings up another arduino unit or pc with modem and sends some data it has collected .It is ideal for places that have a phone but no internet .

I was also investigating the use of warning module arduino that can call another phone without it being rung up and using the ring tone and length of call to issue basic information to another module that listens for ringing and length of ringing .

I've no use for one, but it looks a very good idea. With it, you'd be able to have a remote Arduino automatically 'phone home' to upload collected data. But couldn't a USB shield, with a USB mobile [cell] phone dongle do the same job?

I was also investigating the use of warning module arduino that can call another phone without it being rung up and using the ring tone and length of call to issue basic information to another module that listens for ringing and length of ringing .

I though I had replied to this a while back but it never seemed to make it to the board. You could maybe use DTMF as it allows 16 different tones so with a combination of *, #, A, B, C, D & 0-9 you could maybe send some quite complex messages.